Now we know why Bono is wearing those glasses: it's to hide the tears. He revealed the truth about his shame at a Davos conference:
"I'm going to kick the habit. I'm trying father Al, but oil has been very good for me - those convoys of articulated lorries, petrochemical products, hair gel."
So, when Bono needs to confess about his carbon footprint, he flies to see Al Gore in America. Then he flies to Davos, to tell a conference full of other people who've flown to Davos, all about how upset he is.
Al Gore might be an eco-Priest, Bono. At least he's not a Whisky Priest.